If you are new, why not buy a book on trading than posting on this site. Most people on this site don't know how to trade either so why take their bad advice. I also doubt their ability to read an entire book on trading. Too many pages.
Oanda is a Forex broker that has been around for a very long time and there is not a minimum account size and there is not a minimum position to take. You can open an account with $10 and trade 5 units of a pair like EUR/USD. Per trade profits are calculated down to .0001 cents. So you can trade live and risk as little as you want 24/7. Just a word and it is not really a negative, is Onada is what they call a bucket shop and they do not actually give you a market position, they just give you the position on paper and they fade you by absorbing your profit should you have one. You still realize the actual P&L in your account. Most traders lose so they make what you lose. For profitable traders with larger positions they probably hedge out when a position is taken or trade along with you for their own account.
Yes, if you win consistently in the Forex your broker may hedge your position, especially if you are betting big. He is supposed to hedge ALL positions but that's another story...